Delectopecten vancouverensis fernandoensis (Hertlein, 1925)
HERTLEIN, L. G. 1925. New species of marine fossil Mollusca from western North America. Southern California Academy of Sciences Bulletin, 24 (2): 39-46. [p. 43, pl. 4, figs. 6, 7]
1925 Pecten (Pseudamusium) [sic] vancouverensis fernandoensis Hertlein, 1925
L. G. Hertlein, 1925, plate 25.
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«Shell small, somewhat compressed, pearly. Right valve sculptured by numerous submicroscopic radiating ribs which are crossed by concentric lines forming crosshatched sculpture on the shell, at each intersection a tiny node is developed; the anterior ear is well developed and ornamented by about 5 or 6 radiating ribs crossed by concentric lines of growth, posterior ear ornamented by radiating riblets crossed by concentric lines of growth. Left valve with sculpture similar to that of right, the ears of the left valve are well developed and sculptured similar to that of the right valve. There are about 7 to 9 slight, concentric undulations which are more noticeable on the interior casts of the valves than on the exterior of the valves. Height 16 mm.; length 14 mm.; diameter of left valve approximately 3 mm.; length of hinge line of left valve approximately 10 mm.; apical angle of left valve approximately 90°.
This species attains a size of 20 mm. in height and 20 mm. in length. Type: Left valve No. 16 (L. S. J. U. Type collection), from one-fourth mile south of Taylor well No. 1, and one and one-half miles north of Ventura (on Ventura River) California; A. W. Ambrose collector, Fernando Pliocene; Paratype: Right valve, No. 17, (L. S. J. U. Type collection) from Loc. 155 (L. S. J. U.) drill core from depth of 2,800 feet, about 4,500 feet northwest of Signal Hill, 500 feet east of Orange Avenue and 750 feet north of Willow Street, Long Beach, California. Lower Fernando, Lower Pliocene. Pecten vancouverensis fernandoensis Hertlein is distinguished from P. vancouverensis Whiteaves, by more distinct crosshatched sculpture and usually larger size. P vancouverensis fernandoensis is distinguished from P. vancouverensis sanjuanensis Clark, by finer sculpture and larger size in the present species. P. vancouverensis fernandoensis differs from P. pedroanus Trask, in its characteristic crosshatched sculpture. P. vancouverensis fernandoensis differs from P. randolphi var. tillamookensis Arnold, in that the present species has small nodes developed at the intersection of the crosshatched sculpture, while the variety described by Arnold has finer striae ornamentation on the valves. Leland Stanford Junior University.» LEO GEORGE HERTLEIN, 1925
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«Comments.— The left posterior auricle of D. v. fernandoensis is larger and higher than the left posterior auricle of D. randolphi tiIlamookensis. The angle that the left posterior auricle makes where it joins the shell is about 40 on D. v. fernandoensis compared to about 25 on D. r. tillamookensis. Grau (1959, p. 41) considered D. v. fernandoensis to be a valid species.
Geographic range.— Southern California. Geologic range.— Pliocene to Pleistocene. Occurrence in the California.— Pliocene and Pleistocene: Fernando Formation.» MOORE, E. J. 1984. Tertiary Marine Pelecypods of California: Propeamussidae and Pectinidae. United States Geological Survey Professional Paper, 1228-B: iv + B1-B112, figs. 1-2, pls. 1-42. [p. B16, B17]
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Delectopecten vancouverensis fernandoensis (Hertlein); E. J. Moore, 1984, Tertiary Marine Pelecypods of California: Propeamussidae and Pectinidae, plate 3, figure 10.
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